python正则表达式re模块详解

快速入门

import re

pattern = \'this\'
text = \'Does this text match the pattern?\'

match = re.search(pattern, text)

s = match.start()
e = match.end()

print(\'Found \"{0}\"\\nin \"{1}\"\'.format(match.re.pattern, match.string))
print(\'from {0} to {1} (\"{2}\")\'.format( s, e, text[s:e]))

执行结果：

#python re_simple_match.py 
Found \"this\"
in \"Does this text match the pattern?\"
from 5 to 9 (\"this\")
import re

# Precompile the patterns
regexes = [ re.compile(p) for p in (\'this\', \'that\')]
text = \'Does this text match the pattern?\'

print(\'Text: {0}\\n\'.format(text))

for regex in regexes:
  if regex.search(text):
    result = \'match!\'
  else:
    result = \'no match!\'
    
  print(\'Seeking \"{0}\" -> {1}\'.format(regex.pattern, result))

执行结果：

#python re_simple_compiled.py 
Text: Does this text match the pattern?

Seeking \"this\" -> match!
Seeking \"that\" -> no match!

import re

text = \'abbaaabbbbaaaaa\'

pattern = \'ab\'

for match in re.findall(pattern, text):
  print(\'Found \"{0}\"\'.format(match))

执行结果：

#python re_findall.py 
Found \"ab\"
Found \"ab\"

import re

text = \'abbaaabbbbaaaaa\'

pattern = \'ab\'

for match in re.finditer(pattern, text):
  s = match.start()
  e = match.end()
  print(\'Found \"{0}\" at {1}:{2}\'.format(text[s:e], s, e))

执行结果：

#python re_finditer.py 
Found \"ab\" at 0:2
Found \"ab\" at 5:7